Four species of the genus <i>Boltovskoyella</i> Malumián & Masiuk are recognized in Patagonia, among them, <i>B. paleocenica</i> sp. nov., which is described from Danian shallow marine sediments. Considering that the previous records of <i>Boltovskoyella</i> are from the Middle-Late Eocene, this new species represents the oldest known occurrence of the genus. <i>Boltovskoyella</i> seems to be endemic to Patagonia, shows opportunistic features and prefers temperate-warm water settings.